Any surface that comes into direct contact with food must be both cleaned and sanitized. This is a core requirement of the FDA Food Code and applies to restaurants, cafeterias, food trucks, and home kitchens alike. The rule also extends to childcare settings, where surfaces that touch children’s mouths need the same two-step treatment. Cleaning alone removes dirt and most germs, but sanitizing is the second step that reduces remaining bacteria to safe levels.
Why Cleaning Alone Is Not Enough
Cleaning with soap and water physically removes dirt, grease, and a large share of germs from a surface. But it does not kill the bacteria left behind. Sanitizing uses a chemical solution, typically a diluted bleach or quaternary ammonium product, to reduce those remaining germs to levels that public health codes consider safe.
The order matters. You always clean first, then sanitize. Dirt and food residue can form a barrier that prevents sanitizing chemicals from reaching the surface and doing their job. Skipping the cleaning step makes the sanitizing step far less effective.
Food Contact Surfaces: The Primary Category
Under the FDA Food Code, food contact surfaces must be cleaned and sanitized in every food establishment. The code defines a food contact surface broadly as:
- Any surface of equipment or utensils that directly touches food. This includes cutting boards, knives, prep tables, mixing bowls, plates, pots, pans, and slicers.
- Any surface food may reach through splashing or dripping during normal operations. Think of the rim of a stand mixer, the inside of a blender lid, or the area around a deep fryer.
- Interior surfaces of pipes or ducts that transport cooking oil or fat when drainage is not provided.
The timing requirements are specific. Food contact surfaces must be cleaned and sanitized before each use, after completing a task, at the end of a food processing operation, and any time contamination may have occurred. The one exception is surfaces in continuous use during a single operation, though even these must be addressed once that operation ends.
The Correct Cleaning and Sanitizing Sequence
For manual dishwashing and surface treatment in food service, the process follows a consistent sequence. First, scrape or remove visible food debris. Second, wash the surface with hot, soapy water using friction to loosen remaining residue. Third, rinse with clean water to remove soap. Fourth, apply the sanitizing solution at the correct concentration. Fifth, allow the surface to air dry completely. Do not towel-dry sanitized items, because the towel can reintroduce bacteria.
The sanitizer must stay visibly wet on the surface for its full required contact time to work. That contact time varies by product and can range from 10 seconds to 10 minutes depending on the chemical and what it’s targeting. If the surface dries before the contact time is up, you need to reapply. Always check the product label for the specific time required.
Approved Sanitizer Concentrations
Two sanitizer types dominate food service. Chlorine-based sanitizers (bleach solutions) should be used at 50 to 100 parts per million (ppm). Quaternary ammonium sanitizers, often called “quats,” are typically used at 200 ppm or as the manufacturer directs. Both concentrations should be verified with test strips, not estimated by eye. Too little sanitizer won’t kill enough bacteria; too much can leave a chemical residue on food contact surfaces.
Childcare and Early Education Settings
Childcare facilities follow a parallel logic: any surface that touches a child’s mouth requires both cleaning and sanitizing. This includes highchair trays, plates, infant feeding items like bottles and nipple rings, and toys that children mouth or chew. Highchair trays specifically should be washed, rinsed, and sanitized immediately before and after each use for eating.
Surfaces that contact bodily fluids require a different, stronger treatment. Bathrooms, diaper changing tables, and any surface soiled with blood or body fluids need to be cleaned and then disinfected (not just sanitized). Disinfecting uses stronger chemical concentrations and kills a broader range of pathogens. The distinction is important: sanitizing is for mouth-contact and food-contact surfaces, while disinfecting is reserved for higher-risk contamination scenarios.
Healthcare Settings
In hospitals and clinics, shared patient care equipment that touches intact skin (stethoscopes, blood pressure cuffs, bedpans) must be cleaned and disinfected before and after each patient use. Healthcare facilities generally default to disinfection rather than sanitization because the risk of infection transmission is higher. Every surface in a patient room, from bed rails to light switches to the mattress itself, gets cleaned and disinfected during terminal cleaning after a patient is discharged.
Home Kitchen Surfaces
At home, the same principles from commercial food service apply on a smaller scale. Cutting boards, countertops, knives, and any surface that contacts raw meat, poultry, seafood, or eggs should be washed with soap and water and then sanitized. A simple sanitizing solution of about one tablespoon of unscented liquid bleach per gallon of water falls within the effective range for home use.
Surfaces that don’t contact food, like cabinet fronts or the outside of your refrigerator, only need regular cleaning. The two-step process of cleaning plus sanitizing is specifically for surfaces where bacteria could transfer to something you eat. After sanitizing countertops or cutting boards, let them air dry rather than wiping them with a kitchen towel, which can undo the work you just did.
Surfaces That Only Need Cleaning
Not every surface requires sanitizing. Floors, walls, ceilings, and non-food-contact equipment in a kitchen only need routine cleaning unless they become contaminated with something specific. The same goes for most household surfaces: doorknobs, light switches, and counters in non-kitchen areas are fine with regular soap-and-water cleaning under normal circumstances. The CDC recommends stepping up to disinfection for high-touch surfaces only when someone in the household is sick or immunocompromised.
The key dividing line is straightforward. If the surface touches food or goes into someone’s mouth, clean it and sanitize it. If it touches bodily fluids or is in a setting with sick or vulnerable people, clean it and disinfect it. Everything else just needs to be kept clean.